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Thread: thread pitch and size
02-10-2011, 06:16 AM #1
thread pitch and size
Hello! I am rying to figure out the thread pitch and size of a valve stem , just like on your car tire where the valve cap goes . All I have is a metric thread pitch gauge and I come up with 8mm with a .8 thread pitch . But I am not too sure if it is not an american std pitch as I do not have a gauge to cross reference.
What do you think the size is ???
02-10-2011, 06:27 AM #2
02-10-2011, 08:07 AM #3
IMHO it is .305-32, not anyone's standard AFAIK. I have made screw-on chucks for them, to go with my collection of hand tire pumps (try to have one in each vehicle)
I'd be interested in what you're making. I recently found that Midland Metal Mfg has these chucks, but brass with short thread engagement, instead of steel and long, not as nice or probably durable as I made. It was a PITA to single-point those internal threads. Need to make some more.
02-10-2011, 10:26 AM #4
19/64 = 0.2969" 7.5406mm
5/16 = 0.3125" 7.9375mm
so .305 32 is not a standard tap is it ????
Or am I missing something?
02-10-2011, 12:42 PM #5
02-10-2011, 02:33 PM #6
Thanks for the insight and the thread link it helps.
02-10-2011, 02:38 PM #7
If you can't find what you need i have the Tire & Rim Assoc Handbook at work. It has ALL the specs! If you need it tomorrow, PM me and I can send you a scan of Schrader Valve thread specs that will help you.
02-11-2011, 02:47 PM #8
Ping me back by email or phone if you need addtl specs. The book is 100's of pages long, but what I sent should cover you.
02-12-2011, 05:42 PM #9
Thank You !
02-12-2011, 10:42 PM #10
i (should) have a .305"x32 tap i bought over 20 years ago to make custom valve caps for bikes. was faintly labeled with the size and "schrader". quick google search turned this up: Engineering Supplies - a) 0.305x32 UNS HSS Ground Thread Tap Schrader valve tap
never tried it but 5/16"x32 might be close enough.